Unfortunately, not very much, at all, available in 1/125 scale! 1/96 is grossly oversized, so not even a distant consideration! The closest I have been able to locate are 1/144, but are, also, a bit difficult to find! The kits' 40-mm aa guns are not "terrible", but with a little "massaging", they can be made to look a bit better! The 20-mm guns, are what they are!! The 5"-38 deck mounts are not too bad looking, depending on how fussy you are about them. I added safety railings to the sides of mine, as well as metal ladders on the back sides, and they are not bad in appearance. The railings were made from .5mm brass wire, and the ladder rungs are N-scale, model railroad boxcar rungs. A bit of work to drill and install them, but look pretty good! I wish I had better news to share, but at 1/125, we are pretty much stuck with what is in the kit!
Best of luck with it!
CG